Left Arm to point towards Gun Grip?

[GOAL]

My goal is to get the players Left Arm to point towards a part named "LeftArmHold" inside all the tools within my game. (Make it so the left arm will grip the gun without having to script the CFrame for each tool)

[PROBLEM]

The left arm points backwards and looks upwards.

[SCRIPT]

I have tried a few ways of doing this but all have failed, this is my most recent attempt.

la.C0 = (la.Parent.CFrame:toObjectSpace(local_utl.torso.CFrame,la_hold.CFrame))

(Here are the variables in case you get confused)

la = char["Left Arm"].la_weld
local_utl.torso = --[The player's torso]
la_hold = tool["LeftArmHold"]

May I also state, I am a newbie to CFraming and only just got an understanding of :toObjectSpace and believe I am using it wrong and or not meant to be using it for this situation.

Short introduction of radians:

math.pi = 3.14 -- +unlimited decimals

pi radians equals 180 degrees, so to flip your arm over an axis you need to do

CFrame.Angles(math.pi,0,0)

pi/2 radians equals 90 degrees, so its just a quarter turn, so to rotate your arm over an axis you need to do.

CFrame.Angles(math.pi/2,0,0)

Source: http://wiki.roblox.com/index.php?title=CFrame#Radians

la.C0 = (la.Parent.CFrame:toObjectSpace(local_utl.torso.CFrame,la_hold.CFrame))*CFrame.Angles(math.pi,0,0)

It's possible that this does not directly solve the problem, you could try to move math.pi sometimes and maybe divide it by 2 until the arm is in the right place.